检索结果-南通市图书馆

Nanoimprint lithography-assisted block copolymer self-assembly for hyperfine fabrication of magnetic patterns based on l10-FePt nanoparticles

在线全文

学校读者我要写书评

暂无评论

Science China Chemistry 2025年

作者： Jie Zhang Yi chen Guijun li Zelin Sun Zhengong Meng Wai-Yeung Wong Department of Applied Biology and Chemical Technology and Research Institute for Smart Energy The Hong Kong Polytechnic University The Hong Kong Polytechnic University Shenzhen Research Institute Division of Integrative Systems and Design and Department of Electronic and Computer Engineering The Hong Kong University of Science and Technology School of Flexible Electronics (Future Technology) and Institute of Advanced Materials (IAM) Nanjing Tech University

l10-FePt-type bit-patterned media has provided a promising alternative for ultrahigh-density magnetic recording systems in the current digital era, but rapid fabrication of magnetic patterns with hyperfine bit islands is still challenging, especially with the target for miniaturization and scalable production simultaneously. Herein, Fe,Pt-containing block copolymers were utilized as single-source precursors for solution-processable patterning and subsequent generation of the demanding magnetic FePt dots by in situ pyrolysis. High-throughput nanoimprint lithography was initially employed to fabricate the predefined bit cells precisely,and then the intrinsic self-assembly of phase-separated block copolymers further drove the formation of accurate bit *** from the synergistic effect of top-down lithographic approach and bottom-up self-assembly, the customizable patterns could be achieved for large-scale mass production in targeted areas, but high-density isolated dots could also be accurately aligned along the patterned features after subsequent self-assembly. This reliable strategy would provide a good avenue to precisely construct ultrahigh-density magnetic data storage devices.

关键词：

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

麦草木素结构的研究进展

中国造纸学报 2001年第1期16卷 119-125页

作者：林鹿 C.-l.chen J.S.Gratzl 华南理工大学制浆造纸工程国家重点实验室广州510641 Department of Wood and Paper Science North Carolina State UniversityUSA

讨论了对麦草木素结构研究的进展。麦草木素是GSH型木素 ,分子内部有高度缩合型的“内核”结构 ,异质性是其碱溶性的主要原因。麦草木素与多糖成分有紧密的结合 ,这些多糖成分主要是木聚糖型的半纤维素 ,有“分枝”型和“线性”型两种... 详细信息

讨论了对麦草木素结构研究的进展。麦草木素是GSH型木素 ,分子内部有高度缩合型的“内核”结构 ,异质性是其碱溶性的主要原因。麦草木素与多糖成分有紧密的结合 ,这些多糖成分主要是木聚糖型的半纤维素 ,有“分枝”型和“线性”型两种结合方式 ,“分枝”型对碱溶液有更强的抵抗能力。在麦草木素大分子内部或表面 ,以酯键或醚键形式与一些酚型酸主要是阿魏酸与香豆酸连接 ,这些酯键或醚键的连接位置有α 、β 和γ 位。

关键词：麦草木素结构木聚糖半纤维素结构特性抵抗能力阿魏酸草木分枝碱溶液

Principal Value and Its Applications for One Type of Cauchy–FantappièIntegral and the System of Equations

在线全文

学校读者我要写书评

暂无评论

Acta Mathematica Sinica,English Series 2022年第9期38卷 1537-1550页

作者： lüPing chen School of Mathematical Sciences Xiamen UniversityXiamen 361005P.R.China

It is known that principal value plays vital roles in the study of singular *** this paper,one type of Cauchy–Fantappièintegral with multiple indexes is *** the structure of the kernel is complexity,the Jacobian determinant included in the kernel is expanded for making clearly the expression of the ***,one differential operator is utilized for setting up relations between integrals with higher and usual *** work also concerns the convergent properties of the *** order to study Hadamard principal value and composite formula of this integral,finite and divergent parts will be estimated and *** an application,solvability of the system of integral equations with higher order singularity kernel is discussed.

关键词： Principal value Cauchy–Fantappièintegral piecewise smooth manifold differential operator system of singular integral equation

An Integrated Framework of CAD Tool for an SOI-Based FPGA

在线全文

学校读者我要写书评

暂无评论

Journal of Electronic Science and Technology 2012年第1期10卷 72-77页

作者： Stanley l.chen the Institute of Software and Microelectronics Peking University

For an SOI-FPGA （silicon-on-insulator field programmable gate arrays）（VS1000） fabricated with 0.5 ttm SOI-CMOS （silicon-on-insulator complementary-metal-oxide-semiconductor） process, a complete integrated platform of FPGA computer-aided design （CAD） toolset （VDK） is developed, which can convert the Verilog HDl （hardware description language） description into a bitstream and finally download it into an FPGA. Experiments and testing verify that this FPGA CAD works well and efficiently.

关键词： Bitstream generation field programmable gate arrays computer-aided design,mapping placing&routing synthesis.

在线全文

学校读者我要写书评

暂无评论

基于多切线技术的盾构隧道开挖面稳定性分析

岩土工程学报 2025年第1期47卷 76-84页

作者：钟军豪 CHIAN Siau chen 李永鑫刘明芳陈明辉吴振元龙桂华杨小礼周德中南大学土木工程学院湖南长沙410075 新加坡国立大学土木与环境工程系新加坡117576 合肥工业大学汽车与交通工程学院安徽合肥230009 深圳市市政工程总公司广东深圳518000

针对非线性条件下深埋隧道开挖面稳定性问题,采用多切线技术分段线性近似Power-law(P-l)准则,基于极限分析上限定理,构建1种新的开挖面多曲线圆锥破坏机构,提出1种考虑拉应力截断Tensioncut-off(T-C)效应的开挖面稳定性理论计算方法。... 详细信息

针对非线性条件下深埋隧道开挖面稳定性问题,采用多切线技术分段线性近似Power-law(P-l)准则,基于极限分析上限定理,构建1种新的开挖面多曲线圆锥破坏机构,提出1种考虑拉应力截断Tensioncut-off(T-C)效应的开挖面稳定性理论计算方法。通过与既有文献结果对比,验证所提方法的可靠性。根据反算的应力分布和破坏机构几何特点,探究不同参数条件下T-C对开挖面稳定性的影响。结果表明:(1)在线性条件下,黏聚力较大且内摩擦角较小时,T-C对开挖面临界支护力的影响较大;在非线性条件下,m的增加并不会放大T-C对开挖面稳定性的影响。(2)在抗拉强度较大时,T-C对开挖面稳定性影响较为显著,随着抗拉强度的折减,T-C控制的破坏机构尺寸逐渐减小,且顶部区域明显钝化。

关键词：开挖面稳定性多切线技术 Power-law准则拉应力截断极限分析

Predict sandstone distribution by integrated study of deformed shale using borehole image and seismic data,a case study from northern Gulf of Mexico

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

Petroleum Research 2020年第2期5卷 103-111页

作者： W.W.Xu B.Winkelman T.Wilkinson A.Kumar l.chen R.Hayden J.Gendur R.Hearn D.Shan J.Meyer J.A.Canas O.Mullins Schlumberger(retired) HoustonUSA Talos Energy llC(retired) HoustonUSA Schlumberger HoustonUSA Kosmos Energy HoustonUSA

Many Upper Tertiary reservoirs from the Gulf of Mexico(GoM)are sandstones deposited either in channel-levee systems or lobe systems in the intra-slope deepwater *** of the major uncertainties about those reservoirs is their distribution,which is likely controlled by salt *** current salt structure,however,does not represent the salt structure when the sands were *** is difficult,if not impossible,to restore the salt history based on current salt *** movement resulted in a great amount of deformed shale in *** images on the other hand can be used to characterize the internal structure or texture of deformed shale;and the dips of deformed shale from borehole images may be used to define the paleo slope direction,which controls the movement of deformed *** internal structure or texture of deformed shale,therefore,may provide some information about the history of salt movement,which may also control the sand *** this integrated study,all the available data,including borehole images,seismic volumes,and other petrophysical logs,were used to characterize the reservoir sands and *** reservoir sands are mainly composed of amalgamated sand,layered sand,and laminated *** on dips from borehole images,paleo flow directions of reservoir sands were *** shales are categorized as hemipelagic shale and deformed *** hemipelagic shale has relatively lower and consistent dips;whereas deformed shale has relatively higher variable in both dip magnitude and dip *** integrated study suggests the main reservoir of the field is submarine lobe sands deposited above an allochthonous salt in the *** evacuation of the salt body below the basin created small geographic lower area for sand lobes to *** dips from the deformed shale provided information about the center of the small(or mini)basin,thus established a relationship between the dip pattern and sandstone distribut

关键词： Mass transport deposit Gulf of Mexico Sedimentology Borehole image Integration

Stable copper boron–imidazolate cage as Cu-riched enzyme for highly efficient electrocatalytic CO2 reduction to ethylene

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

Science China Chemistry 2025年

作者： Jun-Qiang chen Qiao-Hong li Qin-long Hong Ping Shao Hai-Xia Zhang Jian Zhang State Key laboratory of Structural Chemistry Fujian Institute of Research on the Structure of Matter Chinese Academy of Sciences

Single-atom catalyst has garnered widespread attention to mimic mature enzymes due to its well-defined atomic structure and coordination environments. However, since the carbon–carbon（C–C） coupling reactions require synergistic catalysis of multiple sites, single-atom catalysts suffer from insufficient active sites and unclear reaction mechanisms. Controlling the reaction intermediates in a precisely targeted pocket through careful metal–organic cage design is therefore crucial. Here, we prepare a tetrahedral [Cu6l4]-type boron–imidazolate cage integrating highly active Cu sites and optimized cavity, which exhibits enzyme like specific catalytic performance in electrochemical CO2reduction reaction（CO2RR） to enhance the selectivity of *** analyses and computational calculations suggest that the single Cu site together with neighboring boron–imidazolate ligands provides suitably synergistic effects that enable the energetically favorable formation of an *COCHO intermediate, a key step determining selectivity. As a result, the [Cu6l4]-type cage of BIC-145 achieves a Faradaic efficiency of 28% for C2H4maintaining an average current density of -3.54 mA cm-2over a 5-hour electrolysis period. This work represents the first example for studying single-metal site catalysts with ultra-low coordination numbers through the rational design of metal–organic cages.

关键词：

[Evaluation of the toxicity of perfluorooctanoic acid toward human colorectal cancer cells using multi-dimensional approaches]

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Se pu = Chinese journal of chromatography 2025年第1期43卷 96-103页

作者： Rui-Jia Zhang Ying-Shi lin lan-Yin Tu Zi-Tong chen Wei-Wei Zhang Tian-Gang luan Bao-Wei chen School of life and Health Sciences Hainan University Haikou 570228 China. School of life Sciences Sun Yat-sen University Guangzhou 510275 China. School of Artificial Intelligence Sun Yat-sen University Zhuhai 519082 China. Guangzhou Center for Disease Control and Prevention Guangzhou 510440 China. School of Marine Sciences Sun Yat-sen University Zhuhai 519082 China.

While human exposure to perfluorooctanoic acid (PFOA) can lead to ulcerative colitis, the molecular mechanisms responsible for PFOA-induced intestinal toxicity are unclear. Herein, we examined the toxicity of PFOA toward human colorectal cancer cells (HCT116) from three dimensions: the cytotoxic phenotype, cell respiration, and transcription levels of metabolism-related genes. Formazan was used to assess how PFOA exposure affects HCT116-cell relative viability, after which the mitochondrial respiratory activities of these cells were determined by analyzing extracellular flux. The quantitative real-time polymerase chain reaction (qPCR) method was used to detect metabolism-related gene expression levels. The cytotoxicity assay revealed that the HCT116 showed significantly inhibited relative activities compared to those of the control when exposed to 300 μmol/l PFOA for 48 h (lls retained at the G0/G1 stage. In contrast, the mitochondrial respiratory activities of the HCT116 were promoted by concentrations of PFOA as low as 50 μmol/l. Two genes related to cellular metabolism (dipeptidase 1 () and sphingosine kinase 1 ()) were found to be related to the PFOA-promoted formation of ulcerative colitis using our self-developed Metabolic Gene and Pathway Query software and Comparative Toxicogenomics Database (CTD). The qPCR studies revealed that and expression levels were enhanced by 8-10 times in HCT116 exposed to 300 μmol/l PFOA relative to the control, whereas this trend was not observed for HCT116 exposed to 50 μmol/l PFOA. Collectively, these results suggest that the respiratory activity of cellular mitochondria may serve as an index for determining the interference effects associated with PFOA and that metabolic pathways mediated by and may be involved in the development of PFOA-induced ulcerative colitis. Future studies should investigate the relationships between changes in metabolism-related genes ( and ) and the mitochondrial respiratory act

关键词： Metabolic Gene and Pathway Query software human colorectal enterotoxicity metabolic disorder perfluorooctanoic acid (PFOA)

THE APPROXIMATION SOlUTIONS FOR HIGHER DIMENSIONAl INTEGRO-DIFFERENTIAl EQUATIONS

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

Acta Mathematica Scientia 2019年第5期39卷 1309-1318页

作者： lüping chen School of Mathematical Sciences Xiamen University

This work deals with approximation solutions to a type of integro-differential equations in several complex variables. It concerns the Cauchy formula on higher dimensional domains. In our study, we make use of multiple power series expansions and an iterative computation method to solve a kind of integro-differential equation. We introduce a symmetrized topology product area which is called a bicylinder. We expand functions and derivatives of them to power series. Moreover we obtain unknown functions by comparing coefficients of the series on both sides of equations. We express the approximation solutions by a regular product of matrixes.

关键词： integro-differential equations polynomial approach Cauchy formula bicylinder