检索结果-南通市图书馆

Reflection Talbot Effect and Application

在线全文

学校读者我要写书评

暂无评论

贵州科学 2013年第4期31卷 3-5页

作者： zhong-mei huang WEN-Bo Hu WEI-Qi huang Institute of Nanophotonic Physics Guizhou University

The reflection Talbot effect under the illumination of Gaussian spherical wave and plane wave is observed on 1D and 2D photonic crystal of silicon prepared by nanosecond laser. It is found that the distance between two adjacent Talbot images increases lineally with increasing of image distance as well as amplification of Talbot images under the illumination of Gaussian spherical wave. The result of theory is coincident with that of experiment, which shows that selecting suitable wavefront shape of input field can enlarge the amplification rate and improve the resolution of Talbot imaging. The reflection Talbot effect will have a lot of good application in microscopy of micro-fabrication on silicon, such as detecting period structures of plasma on line of PLD fabricating.

关键词：复合水凝胶力学性能吸水率抑菌性

Activation for Photoluminescence Emission on NanoSilicon Prepared in Oxygen or Nitrogen Environment

在线全文

学校读者我要写书评

暂无评论

贵州科学 2014年第5期32卷 23-30页

作者： Gang Wang Wei-Qi huang zhong-mei huang Chao-Jian Qin Xin-Jian Miao Institute of Nanophotonic Physics Key Laboratory of Photoelectron Technology and ApplicationGuizhou University State Key Laboratory of Ore Deposit Geochemistry Institute of Geochemistry Chinese Academy of Sciences

The photoluminescence(PL)dynamics of nano-silicon prepared in various environments is investigated,which involves the emission in nanostructures related to a wider band from 550 nm to 900 nm and the localized states emission at 694 nm,605 nm,604 nm and 560 *** is observed that the sharp PL peak on the samples prepared in nitrogen has the shape of single tip near 605 nm,but the shape of twin tips always occurs in the two sharp peaks on the samples prepared in *** threshold behavior and the optical gain are discovered in the PL emission at 694 nm,605 nm and 604 *** experiments demonstrate that the optimum pressure to prepare samples in oxygen for the enhancement of emission near 700 nm is about 10~100 Pa,and the optimum one in oxygen for the enhancement of emission near 600 nm is about 1/10~1 Pa,while in high vacuum(<10μPa) the PL emission becomes weaker.

关键词：物理学物理理论发展光学

Plasmonic light and plasmon lattice produced by interaction between pulsed laser and silicon material

在线全文

学校读者我要写书评

暂无评论

Plasmonic light and plasmon lattice produced by interaction ...

Photoluminescence and Electroluminescence on Nanosilicon Deposited by Yb

第十一届全国硅基光电子材料及器件研讨会

作者： Wei-Qi huang zhong-mei huang Chao-Jian Qin Shi-Rong Liu Institute of Nanophotonic Physics Key Laboratory of Photoelectron technology and application Guizhou University Surface Physics Laboratory Department of Physics Fudan University State Key Laboratory of Ore Deposit Geochemistry Institute of Geochemistry Chinese Academy of Sciences

It is discovered that Plasmonic light and plasmon lattice are produced by interaction between pulsed laser and silicon material. The diffraction pattern of plasmon lattice was observed on multi-layer(Yb:SiO:Si) structure with the Purcell cavities array, which may be similar with the Wigner crystal structure. Stronger plasmonic emission refers to coupling with photon and plasmon confined in the Purcell cavity. Bright visible light occurs in ball shape from plasmon induced by pulsed laser, in which a plasmonic light source is built on silicon. It was demonstrated in the light source that the longitudinal polarized emission along with the direction of longitudinal plasmonic wave is much stronger than that in the vertical direction.

关键词： Visible plasmonic light Plasmon lattice Pulsed laser

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

贵州科学 2014年第5期32卷 31-37页

作者： Tai-Ger Dong Wei-Qi huang zhong-mei huang Xin-Jian Miao Quan L Shi-Rong Liu Chao-Jian Qin Institute of Nanophotonic Physics Key Laboratory of Photoelectron technology and applicationGuizhou University Surface Physics Laboratory Department of PhysicsFudan University State Key Laboratory of Ore Deposit Geochemistry Institute of Geochemistry Chinese Academy of Sciences

Dynamics of photoluminescence(PL) and electroluminescence(EL) on nanosilicon deposited by Yb is *** sharper PL peaks near 700 nm are observed on silicon quantum dots (Si QDs) coated by *** enhanced EL peaks in the wavelength region from 1 200 nm to 1 600 nm are measured on silicon film deposited by *** is discovered that the EL intensity enhances and the peaks number increases with increasing number of Si-Yb *** emission wavelength could be manipulated into the window of optical communication by SiYb bonding on ***-Yb quantum cascade and PIN hybrid light-emitting diode is designed to apply in optical communicating,which is suitable to be integrated on silicon chip.

关键词：光学理论物理学发展

Cobalamin-dependent radical S-adenosyl-L-methionine protein functions with a partner to successively methylate tricyclic indole alkaloid for chuangxinmycin maturation and derivatization

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68卷 308-316页

作者： Sili Wang Jiancheng huang Yanan Du Wei huang Yufeng Xue Xiaokun Xu Guannan zhong Yuanyuan Shi Bin Hong Xiaoying Bian Wen Liu State Key Laboratory of Chemical Biology Shanghai Institute of Organic Chemistry University of Chinese Academy of SciencesChinese Academy of Sciences State Key Laboratory of Microbial Technology Shandong University National Health Commission (NHC) Key Laboratory of Biotechnology for Microbial Drugs Institute of Medicinal BiotechnologyChinese Academy of Medical Science & Peking Union Medical College

Cobalamin(Cbl)-dependent radical S-adenosyl-L-methionine(SAM) proteins constitute the largest collection of the radical SAM superfamily that has hundreds of thousands of individual members. Many of these proteins are involved in the biosynthesis of pharmaceutically important natural products to catalyze chemically demanding reactions. In the biosynthetic pathway of chuangxinmycin(CXM), a unique indole alkaloid antibiotic with potent anti-infective activity, functionalization of the characteristic thiopyrano[4,3,2-cd]indole scaffold by regio-and stereoselective C3-methylation is believed to rely on a Cbl-dependent radical process, which, however, remained to be reconstituted biochemically. We here report the dissection of this enzymatic process, which requires the incorporation of Cxm8, a Cbl-dependent radical SAM protein, with Cxm9, a DUF5825family protein that shares no homology to any proteins of known functions. Cxm8 and Cxm9 function together by forming an unexpected heterodimeric complex that selectively catalyzes C3-methylation of the tricyclic indole-S-hetero ring system in a successive manner, achieving CXM and a recently identified, C3-dimethylated congener. Detailed biochemical characterization,isotope labeling, structural simulation and bioinformatics analysis rationalized the catalysis of the Cxm8/Cxm9 complex and particularly the necessity of the DUF5825 protein for C3-methylase activity. This is the first example that a Cbl-dependent protein acts with a partner to exhibit radical SAM activity.

关键词： cbl-dependent radical SAM protein biosynthesis chuangxinmycin stereoselective methylation

Smaller, faster, lower-power analog RRAM matrix computing circuits without performance compromise

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Science China(Information Sciences) 2025年

作者： Yubiao LUO Pushen ZUO Shiqing WANG zhong SUN Ru huang School of Integrated Circuits Peking University Institute for Artificial Intelligence Peking University Beijing Advanced Innovation Center for Integrated Circuits

Recently, the analog matrix computing (AMC) concept has been proposed for fast, efficient matrix operations, by configuring global feedback loops with crosspoint resistive memory arrays and operational amplifiers (OAs). The implementation of a general real-valued matrix (containing both positive and negative elements) is enabled by using a set of analog inverters,which, however, is considered inefficient regarding circuit compactness, power consumption, and temporal response. Here, with the assistance of the conductance compensation (CC) strategy to take full advantage of the inherent differential inputs of OAs,new AMC circuits without analog inverters are designed. Such a design saves the area occupation and power dissipation of analog inverters, and thus turns to be smaller and lower-power. Simulation results reveal that the new circuit also shows a faster response towards the steady state, thanks to the reduction of poles in the circuit, which, again, is contributed by the elimination of analog inverters. Along with all of these benefits, extensive simulations demonstrate that the CC-AMC circuits do not compromise the computing performance in terms of relative error caused by various non-ideal factors in the circuit.

关键词：

我国农业面源污染现状及草类植物在污染治理中的应用

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

草业科学 2017年第2期34卷 428-435页

作者：钟珍梅黄毅斌李艳春黄秀声陈钟佃冯德庆福建省农业科学院农业生态研究所福建福州350003 福建省丘陵地区循环农业工程技术研究中心福建福州350003

以高投入、高产出、高排放为特征的现代农业在带来巨大经济效益的同时,也带来了一系列的环境问题。本文根据中国统计年鉴及中国农村统计年鉴的数据分析了我国由化肥、农药、养殖废弃物等产生的农业污染现状。结果表明,从改革开放至今,... 详细信息

以高投入、高产出、高排放为特征的现代农业在带来巨大经济效益的同时,也带来了一系列的环境问题。本文根据中国统计年鉴及中国农村统计年鉴的数据分析了我国由化肥、农药、养殖废弃物等产生的农业污染现状。结果表明,从改革开放至今,我国化肥施用量呈逐年递增趋势,其中,2014年化肥施用量同比增加了578.27%,2013年单位耕地施肥量同比增加了391.78%;2012年农药施用量同比增加了1.5倍;同时随着养殖业的迅猛发展,废弃物排放量也逐年递增。针对污染现状,本文列举了目前常用于治理农业污染的草类植物,并探讨推行以草本植物为主的生态沟渠、草皮缓冲带和人工湿地治理面源污染的草业生态模式,提出在面源污染治理中草类植物的选择原则,建议构建循环农业生态模式用于治理面源污染,旨在为农业环境污染治理提供科学依据。

关键词：农业面源污染化肥养殖废弃物草类植物循环农业模式

Quickly obtaining densely dispersed coherent particles in steel matrix and its related mechanical property

在线全文

学校读者我要写书评

暂无评论

International Journal of Minerals,Metallurgy and Materials 2025年第1期32卷 111-118页

作者： Xiaoxiao Wang Qingsong huang School of Chemical Engineering Sichuan UniversityChengdu 610065China

Densely distributed coherent nanoparticles(DCN)in steel matrix can enhance the work-hardening ability and ductility of steel *** the routes to this end can be generally classified into the liquid-solid route and the solid-solid ***,the formation of DCN structures in steel requires long processes and complex *** far,obtaining steel with coherent particle enhancement in a short time remains a bottleneck,and some necessary steps remain ***,we show a high-efficiency liquid-phase refining process reinforced by a dynamic magnetic ***-Y-Mn-O particles had an average size of around(3.53±1.21)nm and can be obtained in just around 180 *** small nanoparticles were coherent with the matrix,implying no accumulated dislocations between the particles and the steel *** findings have a potential application for improving material machining capacity,creep resistance,and radiation resistance.

关键词： ferritic steels coherent particles microstructure compression test work hardening

Economic effect of China's carbon neutrality target under shared socioeconomic pathways

在线全文

学校读者我要写书评

暂无评论

Science China Earth Sciences 2025年第1期68卷 142-157页

作者： Zemiao LIU Xianjin huang Xinxian QI School of Geography and Ocean Science Nanjing University Key Laboratory of Carbon Neutrality and Territory Optimization Ministry of Natural Resources Frontiers Science Center for Critical Earth Material Cycling Nanjing University

Economic feasibility is crucial for achieving the carbon neutrality target. However, current integrated assessments often underestimate the economic impacts of mitigation policies due to the lack of consideration of their economic benefits. This study integrates a warming-labour productivity model with a typical integrated assessment model using shared socioeconomic pathways. It simulates China's economic development and carbon emission levels under both baseline and carbon-neutral policy scenarios, evaluating the economic costs and benefits of emission reduction policies aimed at achieving carbon neutrality. These findings reveal the following:(1) The economic costs of emission reduction policies are projected to peak between 2050 and 2060, ranging from 0.41% to 9.37% of total GDP in the baseline scenario, primarily due to increased energy prices and R&D investments. These costs are expected to decline rapidly after 2070.(2) China's carbon-neutral policies will mitigate global warming, with the economic benefits of mitigation projected to reach 5.65% to 17.24% of China's total GDP by 2100.(3) Lowcarbon scenarios SSP1 and SSP4 could significantly reduce initial economic costs and advance the onset of net economic gains to 2060. This integrated assessment confirms that China's carbon neutrality target offers substantial net economic benefits in the long term. To minimize initial economic costs, efforts should focus on enhancing consumption-side transitions, upgrading lowcarbon technologies, and adopting new energy sources.

关键词： Climate change China Carbon neutrality Economic effects Policy

同方期刊数据库